It’s the most important fundamental

To illustrate the importance of grip I will generally hold the club in 1 finger (index finger with heel pad on top) I will tell my student to pull it out of my hand. The student will usually look at me funny then pull like crazy and watch in amazement as the club does not come out! I follow that up with “if the club is that secure with 1 finger, why do I need to hold the club tight?” I also use a ruler or alignment rod and have my students grip that and I ask them how does it feel different than how they grip it. They say more in the fingers ?